One has to look at the difference in the current US approach to global issues, with comparison to the previous administration. Despite its continuance as the supreme "super power", the US nowadays is more inclined to acquire international support in international affairs. This also, crucially, means shared responsibility. Given that all necessary means might have to be used to prevent Iran from acquiring suspected nuclear weapons, and considering the hardheaded approach by the Iranians, the likelihood of a physical attack on the country may be somewhat high. But, unlike recent times, it is also likely that any reaction from the Iranians will be faced with a "united" approach. This undoubtedly is the result of a more efficient foreign policy by the US.
Death toll from Yemen rebel attack rises to 55 after 10 Saudi troops killed (AP)
from the article: U.S. strike on Iran likelier than ever, former CIA chief says